I keep my horse on my property, I have no arena, all I have is a 50' round pen constructed of removable livestock panels and it's small and rocky. It's on a slight slope, and when it rains all the dirt gets washed away and there's more rocks. I can't get my horse to pick up a lope in it, because it's got rocks in it, and it's really small.
I have ten acres, and I have this one area that's flat and pretty non rocky, and relatively flat that I like to ride on. It's roughly about the size of an arena. I kindof get bored just riding in circles and riding up and down the stretch of it.
What are some good exercises I can do when I am riding my horse in a small, open pasture area?